

var navigator = {
  userAgent: "wx",
  platform: "Mobile"
};
function ImageData() { }

function extend(child, parent) {
  for (var key in parent) {
    if (hasProp.call(parent, key)) child[key] = parent[key]
  }
  function ctor() {
    this.constructor = child
  }
  ctor.prototype = parent.prototype;
  child.prototype = new ctor;
  child.__super__ = parent.prototype;
  return child
}

var hasProp = {}.hasOwnProperty;
var indexOf = [].indexOf ||
  function (item) {
    for (var i = 0,
      l = this.length; i < l; i++) {
      if (i in this && this[i] === item) return i
    }
    return - 1
  };
var slice = [].slice;

function EventEmitter() {
  this._events = this._events || {};
  this._maxListeners = this._maxListeners || undefined
}

EventEmitter.EventEmitter = EventEmitter;
EventEmitter.prototype._events = undefined;
EventEmitter.prototype._maxListeners = undefined;
EventEmitter.defaultMaxListeners = 10;
EventEmitter.prototype.setMaxListeners = function (n) {
  if (!isNumber(n) || n < 0 || isNaN(n)) throw TypeError("n must be a positive number");
  this._maxListeners = n;
  return this
};
EventEmitter.prototype.emit = function (type) {
  var er, handler, len, args, i, listeners;
  if (!this._events) this._events = {};
  if (type === "error") {
    if (!this._events.error || isObject(this._events.error) && !this._events.error.length) {
      er = arguments[1];
      if (er instanceof Error) {
        throw er
      } else {
        var err = new Error('Uncaught, unspecified "error" event. (' + er + ")");
        err.context = er;
        throw err
      }
    }
  }
  handler = this._events[type];
  if (isUndefined(handler)) return false;
  if (isFunction(handler)) {
    switch (arguments.length) {
      case 1:
        handler.call(this);
        break;
      case 2:
        handler.call(this, arguments[1]);
        break;
      case 3:
        handler.call(this, arguments[1], arguments[2]);
        break;
      default:
        args = Array.prototype.slice.call(arguments, 1);
        handler.apply(this, args)
    }
  } else if (isObject(handler)) {
    args = Array.prototype.slice.call(arguments, 1);
    listeners = handler.slice();
    len = listeners.length;
    for (i = 0; i < len; i++) listeners[i].apply(this, args)
  }
  return true
};
EventEmitter.prototype.addListener = function (type, listener) {
  var m;
  if (!isFunction(listener)) throw TypeError("listener must be a function");
  if (!this._events) this._events = {};
  if (this._events.newListener) this.emit("newListener", type, isFunction(listener.listener) ? listener.listener : listener);
  if (!this._events[type]) this._events[type] = listener;
  else if (isObject(this._events[type])) this._events[type].push(listener);
  else this._events[type] = [this._events[type], listener];
  if (isObject(this._events[type]) && !this._events[type].warned) {
    if (!isUndefined(this._maxListeners)) {
      m = this._maxListeners
    } else {
      m = EventEmitter.defaultMaxListeners
    }
    if (m && m > 0 && this._events[type].length > m) {
      this._events[type].warned = true;
      console.error("(node) warning: possible EventEmitter memory " + "leak detected. %d listeners added. " + "Use emitter.setMaxListeners() to increase limit.", this._events[type].length);
      if (typeof console.trace === "function") {
        console.trace()
      }
    }
  }
  return this
};
EventEmitter.prototype.on = EventEmitter.prototype.addListener;
EventEmitter.prototype.once = function (type, listener) {
  if (!isFunction(listener)) throw TypeError("listener must be a function");
  var fired = false;
  function g() {
    this.removeListener(type, g);
    if (!fired) {
      fired = true;
      listener.apply(this, arguments)
    }
  }
  g.listener = listener;
  this.on(type, g);
  return this
};
EventEmitter.prototype.removeListener = function (type, listener) {
  var list, position, length, i;
  if (!isFunction(listener)) throw TypeError("listener must be a function");
  if (!this._events || !this._events[type]) return this;
  list = this._events[type];
  length = list.length;
  position = -1;
  if (list === listener || isFunction(list.listener) && list.listener === listener) {
    delete this._events[type];
    if (this._events.removeListener) this.emit("removeListener", type, listener)
  } else if (isObject(list)) {
    for (i = length; i-- > 0;) {
      if (list[i] === listener || list[i].listener && list[i].listener === listener) {
        position = i;
        break
      }
    }
    if (position < 0) return this;
    if (list.length === 1) {
      list.length = 0;
      delete this._events[type]
    } else {
      list.splice(position, 1)
    }
    if (this._events.removeListener) this.emit("removeListener", type, listener)
  }
  return this
};
EventEmitter.prototype.removeAllListeners = function (type) {
  var key, listeners;
  if (!this._events) return this;
  if (!this._events.removeListener) {
    if (arguments.length === 0) this._events = {};
    else if (this._events[type]) delete this._events[type];
    return this
  }
  if (arguments.length === 0) {
    for (key in this._events) {
      if (key === "removeListener") continue;
      this.removeAllListeners(key)
    }
    this.removeAllListeners("removeListener");
    this._events = {};
    return this
  }
  listeners = this._events[type];
  if (isFunction(listeners)) {
    this.removeListener(type, listeners)
  } else if (listeners) {
    while (listeners.length) this.removeListener(type, listeners[listeners.length - 1])
  }
  delete this._events[type];
  return this
};
EventEmitter.prototype.listeners = function (type) {
  var ret;
  if (!this._events || !this._events[type]) ret = [];
  else if (isFunction(this._events[type])) ret = [this._events[type]];
  else ret = this._events[type].slice();
  return ret
};
EventEmitter.prototype.listenerCount = function (type) {
  if (this._events) {
    var evlistener = this._events[type];
    if (isFunction(evlistener)) return 1;
    else if (evlistener) return evlistener.length
  }
  return 0
};
EventEmitter.listenerCount = function (emitter, type) {
  return emitter.listenerCount(type)
};
function isFunction(arg) {
  return typeof arg === "function"
}
function isNumber(arg) {
  return typeof arg === "number"
}
function isObject(arg) {
  return typeof arg === "object" && arg !== null
}
function isUndefined(arg) {
  return arg === void 0
}

var GIF = function (superClass) {
  var defaults, frameDefaults;
  extend(GIF, superClass);
  defaults = {
    workerScript: "gif.worker.js",
    workers: 1,
    repeat: 0,
    background: "#fff",
    quality: 10,
    width: null,
    height: null,
    transparent: null,
    debug: false,
    dither: false
  };
  frameDefaults = {
    delay: 500,
    copy: false
  };
  function GIF(options) {
    var base, key, value;
    this.running = false;
    this.options = {};
    this.frames = [];
    this.freeWorkers = [];
    this.activeWorkers = [];
    this.setOptions(options);
    for (key in defaults) {
      value = defaults[key];
      if ((base = this.options)[key] == null) {
        base[key] = value
      }
    }
  }
  GIF.prototype.setOption = function (key, value) {
    this.options[key] = value;
    if (this._canvas != null && (key === "width" || key === "height")) {
      return this._canvas[key] = value
    }
  };
  GIF.prototype.setOptions = function (options) {
    var key, results, value;
    results = [];
    for (key in options) {
      if (!hasProp.call(options, key)) continue;
      value = options[key];
      results.push(this.setOption(key, value))
    }
    return results
  };
  GIF.prototype.addFrame = function (image, options) {
    var frame, key;
    if (options == null) {
      options = {}
    }
    frame = {};
    frame.transparent = this.options.transparent;
    for (key in frameDefaults) {
      frame[key] = options[key] || frameDefaults[key]
    }
    if (this.options.width == null) {
      this.setOption("width", image.width)
    }
    if (this.options.height == null) {
      this.setOption("height", image.height)
    }
    if (typeof ImageData !== "undefined" && ImageData !== null && image instanceof ImageData) {
      frame.data = image.data
    } else if (typeof CanvasRenderingContext2D !== "undefined" && CanvasRenderingContext2D !== null && image instanceof CanvasRenderingContext2D || typeof WebGLRenderingContext !== "undefined" && WebGLRenderingContext !== null && image instanceof WebGLRenderingContext) {
      if (options.copy) {
        frame.data = this.getContextData(image)
      } else {
        frame.context = image
      }
    } else if (image.childNodes != null) {
      if (options.copy) {
        frame.data = this.getImageData(image)
      } else {
        frame.image = image
      }
    } else {
      throw new Error("Invalid image")
    }
    return this.frames.push(frame)
  };
  GIF.prototype.render = function () {
    var i, j, numWorkers, ref;
    if (this.running) {
      throw new Error("Already running")
    }
    if (this.options.width == null || this.options.height == null) {
      throw new Error("Width and height must be set prior to rendering")
    }
    this.running = true;
    this.nextFrame = 0;
    this.finishedFrames = 0;
    this.imageParts = function () {
      var j, ref, results;
      results = [];
      for (i = j = 0, ref = this.frames.length; 0 <= ref ? j < ref : j > ref; i = 0 <= ref ? ++j : --j) {
        results.push(null)
      }
      return results
    }.call(this);
    numWorkers = this.spawnWorkers();
  };
  GIF.prototype.abort = function () {
    var worker;
    while (true) {
      worker = this.activeWorkers.shift();
      if (worker == null) {
        break
      }
      worker.terminate()
    }
    this.running = false;
    return this.emit("abort")
  };
  GIF.prototype.destory = function () {
    var worker;
    while (true) {
      worker = this.activeWorkers.shift();
      if (worker == null) {
        break
      }
      worker.terminate()
    }
    while (true) {
      worker = this.freeWorkers.shift();
      if (worker == null) {
        break
      }
      worker.terminate()
    }
    this.running = false;
    return this.emit("abort")
  };
  GIF.prototype.spawnWorkers = function () {
    var j, numWorkers, ref, results;
    numWorkers = Math.min(this.options.workers, this.frames.length); (function () {
      results = [];
      for (var j = ref = this.freeWorkers.length; ref <= numWorkers ? j < numWorkers : j > numWorkers; ref <= numWorkers ? j++ : j--) {
        results.push(j)
      }
      return results
    }).apply(this).forEach(function (_this) {
      return function (i) {
        var worker;
        //console.log("spawning worker " + i);
        worker = new Worker(_this.options.workerScript);
        worker.onmessage = function (msg) {
          var msg = msg.data;
          if (msg == "init") {
            //console.log("gif.js init start.");
            if (_this.options.globalPalette === true) {
              _this.renderNextFrame()
            } else {
              for (i = j = 0, ref = numWorkers; 0 <= ref ? j < ref : j > ref; i = 0 <= ref ? ++j : --j) {
                _this.renderNextFrame()
              }
            }
            //console.log("gif.js init start>>1");
            _this.emit("start");
            //console.log("gif.js init start>>2");
            _this.emit("progress", 0);
            //console.log("gif.js init start>>3");
            return;
          }
          //console.log("gif.js before return frameFinished", msg);
          _this.activeWorkers.splice(_this.activeWorkers.indexOf(worker), 1);
          _this.freeWorkers.push(worker);
          return _this.frameFinished(msg)
        };
        return _this.freeWorkers.push(worker)
      }
    }(this));
    return numWorkers
  };
  GIF.prototype.frameFinished = function (frame) {
    var i, j, ref;
    //console.log("frame " + frame.index + " finished - " + this.activeWorkers.length + " active");
    this.finishedFrames++;
    this.emit("progress", this.finishedFrames / this.frames.length);
    this.imageParts[frame.index] = frame;
    if (this.options.globalPalette === true) {
      this.options.globalPalette = frame.globalPalette;
      //console.log("global palette analyzed");
      if (this.frames.length > 2) {
        for (i = j = 1, ref = this.freeWorkers.length; 1 <= ref ? j < ref : j > ref; i = 1 <= ref ? ++j : --j) {
          this.renderNextFrame()
        }
      }
    }
    if (indexOf.call(this.imageParts, null) >= 0) {
      return this.renderNextFrame()
    } else {
      return this.finishRendering()
    }
    //console.log("gif.js frameFinished OK.");
  };
  GIF.prototype.finishRendering = function () {
    var data, frame, i, image, j, k, l, len, len1, len2, len3, offset, page, ref, ref1, ref2;
    len = 0;
    ref = this.imageParts;
    for (j = 0, len1 = ref.length; j < len1; j++) {
      frame = ref[j];
      len += (frame.data.length - 1) * frame.pageSize + frame.cursor
    }
    len += frame.pageSize - frame.cursor;
    //console.log("rendering finished - filesize " + Math.round(len / 1e3) + "kb");
    data = new Uint8Array(len);
    offset = 0;
    ref1 = this.imageParts;
    for (k = 0, len2 = ref1.length; k < len2; k++) {
      frame = ref1[k];
      ref2 = frame.data;
      for (i = l = 0, len3 = ref2.length; l < len3; i = ++l) {
        page = ref2[i];
        var arr = Object.keys(page).map(function (key) { return page[key]; });
        data.set(arr, offset);
        if (i === frame.data.length - 1) {
          offset += frame.cursor
        } else {
          offset += frame.pageSize
        }
      }
    }
    // image = new Blob([data], {
    //   type: "image/gif"
    // });
    return this.emit("finished", data)
  };
  GIF.prototype.renderNextFrame = function () {
    var frame, task, worker;
    if (this.freeWorkers.length === 0) {
      throw new Error("No free workers")
    }
    if (this.nextFrame >= this.frames.length) {
      return
    }
    frame = this.frames[this.nextFrame++];
    worker = this.freeWorkers.shift();
    task = this.getTask(frame);
    //console.log("starting frame " + (task.index + 1) + " of " + this.frames.length);
    this.activeWorkers.push(worker);
    return worker.postMessage(task)
  };
  GIF.prototype.getContextData = function (ctx) {
    return ctx.getImageData(0, 0, this.options.width, this.options.height).data
  };
  GIF.prototype.getImageData = function (image) {
    var ctx;
    if (this._canvas == null) {
      this._canvas = document.createElement("canvas");
      this._canvas.width = this.options.width;
      this._canvas.height = this.options.height
    }
    ctx = this._canvas.getContext("2d");
    ctx.setFill = this.options.background;
    ctx.fillRect(0, 0, this.options.width, this.options.height);
    ctx.drawImage(image, 0, 0);
    return this.getContextData(ctx)
  };
  GIF.prototype.getTask = function (frame) {
    var index, task;
    index = this.frames.indexOf(frame);
    task = {
      index: index,
      last: index === this.frames.length - 1,
      delay: frame.delay,
      transparent: frame.transparent,
      width: this.options.width,
      height: this.options.height,
      quality: this.options.quality,
      dither: this.options.dither,
      globalPalette: this.options.globalPalette,
      repeat: this.options.repeat,
      canTransfer: false
    };
    if (frame.data != null) {
      task.data = frame.data
    } else if (frame.context != null) {
      task.data = this.getContextData(frame.context)
    } else if (frame.image != null) {
      task.data = this.getImageData(frame.image)
    } else {
      throw new Error("Invalid frame")
    }
    return task
  };
  return GIF
}(EventEmitter);
try{
  module.exports.GIF = GIF;
  module.exports.ImageData = ImageData;
}catch(e){
  console.log(e);
}

